Booster for loose leaf ring books



July 18, 1933. J. SCHADE 1,918,567

BOOSTER FOR LOOSE LEAF RING BOOKS Filed May 5, 1931 :ETES- L ELS- 2- IE- 5 /f\ Lgf Zan ver? fo 7^ kiff/02774,'

Patented July 18, 1933 "UNITED STATES JOHN SCHADE, orY HOLYOKE, MAssAcHUSnTTsQsSIGNOR rro NATIONAL BLANK BOOK COMPANY, OF HOLYOKE, MASSACHUSETTS, AoORroRA'r-I'ON AorlivrAsseCHUSETTs y Boos'rnnron LOOSE LEAF "RING BOOKS Application filed May 5,

My invention relates to loose leaf books of the kind known as ring binders in which curved prongs are carried by flat metal plates or strips hingedly connected attheir inner edges and confined along thei1I outer edges within the inturned edges of a resilient plate, so that the prongs are opened and closed with a spring action.

But the present invention has reference solely` to what are known as boosters that are manipulated to open the prongs and that are located at the ends of the binder, the object or" the invention being to provide an entirely new style of booster that extends above the prong carrying strips or plates and has side portions that fulcrum against the outer edges of said strips, said booster having a com'- paratively small tip at its inner end that has a lifting engagement with the inner edgesA oi said strips, so that when the booster is depressed it will b-ear down against the outer edges ot the strips and lift at the inner edges of the latter, thus tending to spread apart the edges of the confining plate and lessening resistance which the booster has to overcome in order to force the inner edges of the strips upwardly to open the prongs.

Referring to the accompanying drawing which is to be read as a part of this description, l

Figure 1 is a plan view of a ring binder with the rings closed and equipped with my improved booster, the cover plate being broken away at one end- Figure 21s a section atlthe linei2-2 of Figure 1- Figure 3 is a bottom view broken away- Figure 4 is an end view- Figure 5 is a section atthe line 2-2 of Figure 1 showing the positionthe parts asn sume when the booster has been depressed- Figure 6 is a broken plan view showing a similar type of booster applied to heavy rookable structure- Figure 7 is a section at the line 7-7 of Figure 9 is a brokenntop'view similar to 1931. sel-iai No. 535,126n

Figure 1, but showing a modification of the liftingconnection between the inner end of the booster andthe prong-carryingstrips.

Similar numeralsoic reference will be used to denote'like parts `in the several figures of the' drawing. y

Referring to Figures 1 to 5 inclusive, 1 is the cov-er plate whose side edges are inturned as shown at 2. 3 are the metal plates or strips whose inner edges are hingedly connected and whose out-er edges are coniined within the inturned edges 2, and 4 are the prongs carried by said strips, all these parts and arrangements being well known and common to binders of this type.

The boosters at the ends of the binder each comprise a finger piece 5 from which a part 6 extends inwardly above the strips 3 and is fulcrumed at the sides 7 against the outer edges'of said strips, the inner or tip end 8 of the booster passing through openings 9 in the strips and then clinched beneath the latter as shown at 10;

A downward pressure on the linger piece 5 when the parts are in the position shown at either Figures 1, 2 or 4, wiil lift the inner edges of the strips to the position shown at Figure 5, and this will, ot' course, open the prongs as is usual in binders of this type.

Referring to Figures 6, 7, and 8, I have shown the booster applied to a ring binder that has integral side portions 11 angularly disposed and pivoted by a rod 12 to the back of the binder, the prong carrying strips 3 being hingedly connected at their inner edges and confined at their outeredges within inturned portions 14 of the sides 11, the inturned edges 2 of the cover plate 1 confining these portions 14 so that it will be clear that a binder of this type is not only rockable fromside to side, but requires vmore power to open the prongs.

Accordingly the booster employed comprises a comparatively long lever 15 whose inner end 16 is passed through an opening 17 in the cover plate at a location remote from the end of the binder,y and this end 16 is abovethe prong carrying plates or strips and has lateral extensions 18 that fulcrum against the outer edges of said strips, the extreme CII 2 j l l 1,918,567

inner or tip end of the booster extending through openings in the strips and clinched beneath the latter precisely in the manner and for the purpose hereinbefore described.

Referring to Figure 9, the lifting connection betweenl the inner end of the-booster and the prong carrying strips, is made by lancing small spursA 19 from the innerA edges of saidstrips, passing such spurs up through an opening 2O in the inner end of the booster, and then clinching them, this construction being substantially the direct opposite to that heretofore described.

What is claimed is z 4 l. A sheet holding structure for loose leaf books comprising a pair of prong carrying plates hingedly connected at their inner edges and confined ,Within a spring plate at their outer edges, a booster mounted on the upper side of said prong plates and fulcrumed thereon adjacent the outer edges thereof and having a tongue Which projects through an opening yat the inner edges of the prong plates and contacts With the underside thereof to exert an opening pressure.

'2. A loose leaf binder having a pair of articulated spring pressed toggle plates, a slot ineach plate adjacent its end, said slots being opposite each other, and a booster lever fulcrumed upon the plates adjacent their ends having an armengaged by the opposite slots whereby the booster lever is maintained in its proper position.

3. A loose leaf binder having a pair of articulated toggle plates having slots in their adjacent margins, a booster lever fulcrumed upon the plates and having a portion thereof engaging in the slots to'prevent the displacement of the lever.

` lJOHN SCHADE. 

